Senate twins are home-state senators who have composite scores within 5 points of each other. Senate odd couples are home-state senators whose composite scores are more than 40 points apart.
(Key: Composite Liberal Score, Composite Conservative Score, Differential Between Senators)
TWINS
Rhode Island
Jack Reed, D: 77.8, 22.2, 0.0
Sheldon Whitehouse, D: 77.8, 22.2
Kansas
Jerry Moran, R: 25.3, 74.7, 0.8
Pat Roberts, R: 24.5, 75.5
Wyoming
John Barrasso, R: 10.7, 89.3, 0.9
Michael Enzi, R: 9.8, 90.2
Arizona
Jon Kyl, R: 20.2, 79.8, 1.4
John McCain, R: 18.8, 81.2
Maine
Susan Collins, R: 46.3, 53.7, 1.3
Olympia Snowe, R: 45.0, 55.0
Idaho
Mike Crap, R: 9.2, 90.8, 2.1
James Risch, R: 11.3, 88.7
Maryland
Ben Cardin, D: 83.3, 16.7, 2.2
Barbara Mikulski, D: 85.5, 14.5
Georgia
Saxby Chambliss, R: 23.3, 76.7, 2.5
Johnny Isakson, R: 25.8, 74.2
Colorado
Michael Bennet, D: 68.8, 31.2, 3.2
Mark Udall, D: 72.0, 28.0
Utah
Orrin Hatch, R: 17.7, 82.3, 3.6
Mike Lee, R: 21.3, 78.7
Virginia
Mark Warner, D: 69.5, 30.5, 4.7
Jim Webb, D: 64.8, 35.2
Montana
Max Baucus, D: 63.8, 36.2, 4.9
Jon Tester, D: 68.7 31.3, 4.9
(Key: Composite Liberal Score, Composite Conservative Score, Differential Between Senators)
ODD COUPLES
Iowa
Chuck Grassley, R: 20.7, 79.3, 64.8
Tom Harkin, D: 85.5, 14.5
Wisconsin
Ron Johnson, R: 5.8, 94.2, 63.9
Herb Kohl, D: 5.8 94.2, 63.9
North Carolina
Richard Burr, R: 11.3, 88.7, 59.7
Kay Hagan,D: 71.0, 29.0
Ohio
Sherrod Brown, D: 85.5, 14.5, 55.7
Rob Portman, R: 29.8, 70.2
Nevada
Dean Heller, R: 23.7, 76.3, 54.5
Harry Reid, D: 78.2, 21.8
Pennsylvania:
Robert Casey, D: 73.3, 26.7, 53.5
Pat Toomey, R: 19.8, 80.2
South Dakota
Tim Johnson, D: 73.0, 27.0, 51.0
John Thune, R: 22.0, 78.0
Louisiana
Mary Landrieu, D: 61.3, 38.7, 50.3
David Vitter, R: 11.0, 89.0
New Hampshire
Kelly Ayotte, R: 19.2, 80.8, 47.6
Jeanne Shaheen, D: 66.8, 33.2
Florida
Bill Nelson, D: 63.5: 36.5, 46.8
Marco Rubio, R: 16.7, 83.3
Illinois
Dick Durbin, D: 86.5, 13.5, 46.5
Mark Kirk, R: 40.0, 60.0
This article appears in the Feb. 25, 2012, edition of National Journal.
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